Gabbott

I actually have learned this is a Balboa system as well.

Hello, I have a Hot tub that recently starting to make a louder noise while circulating. It's not noticeable when the regular jets are being used. Only when the tub is not in use you can hear a high pitch noise. The water seems to be circulating the same. I pulled the access panel and saw to large pumps but didnt seem to see any small circulating pump. Any thoughts?